/* roulang page: index */
:root {
  --primary: #6D28D9;
  --primary-hover: #8B5CF6;
  --accent: #14B8A6;
  --accent-hover: #2DD4BF;
  --gold: #F59E0B;
  --dark-bg: #0B1120;
  --dark-panel: #1E293B;
  --light-panel: #F8FAFC;
  --text-main: #1E293B;
  --text-muted: #64748B;
  --text-muted-dark: #94A3B8;
  --border-light: #E2E8F0;
  --radius-lg: 12px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  background: #ffffff;
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  text-decoration: none;
  color: inherit;
  transition: color .2s ease;
}
a:focus-visible {
  outline: 2px solid #c4b5fd;
  outline-offset: 2px;
  border-radius: 4px;
}
button {
  font-family: inherit;
  cursor: pointer;
}
.container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
@media (min-width: 640px) {
  .container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}
@media (min-width: 1024px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.section-pad {
  padding-top: 4rem;
  padding-bottom: 4rem;
}
@media (min-width: 768px) {
  .section-pad {
    padding-top: 6rem;
    padding-bottom: 6rem;
  }
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: .6rem;
}
.section-eyebrow::before {
  content: '';
  width: 1.75rem;
  height: 2px;
  background: var(--gold);
  border-radius: 999px;
  display: inline-block;
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-bottom: .6rem;
}
@media (min-width: 768px) {
  .section-title {
    font-size: 2.25rem;
  }
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 46rem;
}

.section-head {
  margin-bottom: 2.75rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--primary);
  color: #ffffff;
  font-weight: 500;
  font-size: .95rem;
  padding: .85rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all .2s ease;
}
.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(109, 40, 217, .3);
}
.btn-primary:active {
  transform: scale(.97);
}

.btn-outline-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: transparent;
  color: #ffffff;
  font-weight: 500;
  font-size: .95rem;
  padding: .85rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,.35);
  transition: all .2s ease;
}
.btn-outline-light:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.6);
}

.btn-dark-panel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: #ffffff;
  color: var(--primary);
  font-weight: 600;
  font-size: .95rem;
  padding: .8rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all .2s ease;
}
.btn-dark-panel:hover {
  background: #f1f5f9;
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: #ffffff;
  color: var(--text-main);
  font-weight: 500;
  font-size: .95rem;
  padding: .85rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all .2s ease;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--accent);
  color: #0f172a;
  font-weight: 600;
  font-size: .95rem;
  padding: .85rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all .2s ease;
}
.btn-accent:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(20, 184, 166, .3);
}

.nav-link {
  position: relative;
  font-size: .95rem;
  font-weight: 500;
  color: #334155;
  padding: .4rem .15rem;
  transition: color .2s ease;
}
.nav-link:hover {
  color: var(--primary);
}
.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: all .2s ease;
}
.card:hover {
  border-color: #c4b5fd;
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .2rem .75rem;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 500;
  background: #f3e8ff;
  color: #6d28d9;
}

.badge-accent {
  background: rgba(20, 184, 166, .12);
  color: #0f766e;
}

.badge-gold {
  background: rgba(245, 158, 11, .12);
  color: #b45309;
}

.text-gradient {
  background: linear-gradient(120deg, #a78bfa 0%, #2dd4bf 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.1;
  color: #2dd4bf;
  letter-spacing: -.02em;
}
@media (min-width: 768px) {
  .stat-number {
    font-size: 3.25rem;
  }
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-item.open .faq-answer {
  max-height: 320px;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  color: var(--primary);
}
.faq-icon {
  transition: transform .3s ease;
  flex-shrink: 0;
}

.form-control {
  width: 100%;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: .75rem 1rem;
  font-size: .925rem;
  color: var(--text-main);
  background: #fff;
  transition: border-color .2s ease, box-shadow .2s ease;
  outline: none;
}
.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(109, 40, 217, .12);
}
.form-control::placeholder {
  color: #94a3b8;
}

.footer-link {
  font-size: .9rem;
  color: var(--text-muted-dark);
  transition: color .2s ease;
}
.footer-link:hover {
  color: #e2e8f0;
}

@media (max-width: 1023px) {
  .mobile-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 12px 24px rgba(0,0,0,.08);
    padding: .5rem 1rem 1rem;
    display: none;
  }
  .mobile-menu.open {
    display: block;
  }
  .mobile-menu .nav-link {
    display: block;
    padding: .85rem .25rem;
    border-bottom: 1px solid #f1f5f9;
    font-size: 1rem;
    color: var(--text-main);
  }
  .mobile-menu .nav-link.active {
    color: var(--primary);
    font-weight: 600;
  }
  .mobile-menu .nav-link:last-child {
    border-bottom: none;
  }
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
  background: #c7d2fe;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #a5b4fc;
}

/* roulang page: category1 */
:root {
      --color-primary: #6D28D9;
      --color-primary-hover: #8B5CF6;
      --color-teal: #14B8A6;
      --color-teal-hover: #2DD4BF;
      --color-amber: #F59E0B;
      --color-bg-light: #F8FAFC;
      --color-bg-dark: #0B1120;
      --color-text: #1E293B;
      --color-text-sub: #64748B;
      --color-border: #E2E8F0;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      background-color: #ffffff;
      color: var(--color-text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    button, input, textarea { font-family: inherit; }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1rem;
      padding-right: 1rem;
    }
    @media (min-width: 768px) {
      .container { padding-left: 1.5rem; padding-right: 1.5rem; }
    }

    .nav-link {
      position: relative;
      font-size: 0.95rem;
      font-weight: 500;
      color: #475569;
      padding: 0.5rem 0.25rem;
      transition: color 0.2s ease, border-color 0.2s ease;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover { color: var(--color-primary); }
    .nav-link.active {
      color: var(--color-primary);
      font-weight: 600;
      border-bottom-color: var(--color-primary);
    }
    .nav-link:focus-visible {
      outline: 2px solid #C4B5FD;
      outline-offset: 2px;
      border-radius: 4px;
    }

    .footer-link {
      color: #94A3B8;
      font-size: 0.875rem;
      transition: color 0.2s ease, padding-left 0.2s ease;
    }
    .footer-link:hover { color: #ffffff; padding-left: 2px; }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-item.faq-open .faq-answer { max-height: 240px; }
    .faq-item.faq-open .faq-icon { transform: rotate(45deg); color: var(--color-primary); }
    .faq-icon { transition: transform 0.3s ease, color 0.3s ease; }
    .faq-item.faq-open .faq-question-text { color: var(--color-primary); }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--color-primary);
      color: #ffffff;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.75rem 1.75rem;
      border-radius: 8px;
      border: 1px solid transparent;
      transition: all 0.2s ease;
      cursor: pointer;
    }
    .btn-primary:hover { background-color: var(--color-primary-hover); }
    .btn-primary:active { transform: scale(0.97); }
    .btn-primary:focus-visible {
      outline: 2px solid #C4B5FD;
      outline-offset: 2px;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: #ffffff;
      color: #475569;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.75rem 1.75rem;
      border-radius: 8px;
      border: 1px solid #E2E8F0;
      transition: all 0.2s ease;
      cursor: pointer;
    }
    .btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }
    .btn-secondary:active { transform: scale(0.97); }
    .btn-secondary:focus-visible {
      outline: 2px solid #C4B5FD;
      outline-offset: 2px;
    }

    .btn-white {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: #ffffff;
      color: var(--color-primary);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.75rem;
      border-radius: 8px;
      transition: all 0.2s ease;
      cursor: pointer;
    }
    .btn-white:hover { background-color: #F1F5F9; }
    .btn-white:active { transform: scale(0.97); }

    .step-card {
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .step-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .sidebar-card {
      background: #ffffff;
      border: 1px solid var(--color-border);
      border-radius: 12px;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s ease;
    }
    .sidebar-card:hover { box-shadow: var(--shadow-md); }

    .sidebar-link {
      display: flex;
      align-items: center;
      padding: 0.625rem 0.875rem;
      border-radius: 8px;
      color: #475569;
      font-size: 0.9rem;
      transition: all 0.2s ease;
    }
    .sidebar-link:hover { background-color: #F5F3FF; color: var(--color-primary); }
    .sidebar-link.active {
      background-color: #F5F3FF;
      color: var(--color-primary);
      font-weight: 600;
    }

    .feature-card {
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #C4B5FD;
    }

    .breadcrumb a {
      color: #64748B;
      transition: color 0.2s ease;
    }
    .breadcrumb a:hover { color: var(--color-primary); }
    .breadcrumb .current { color: #1E293B; font-weight: 500; }

    .mobile-menu-link {
      display: block;
      padding: 0.875rem 1rem;
      border-bottom: 1px solid #F1F5F9;
      color: #475569;
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.2s ease;
    }
    .mobile-menu-link:hover { color: var(--color-primary); background-color: #F8FAFC; }
    .mobile-menu-link.active { color: var(--color-primary); background-color: #F5F3FF; font-weight: 600; }

    .cover-img {
      object-fit: cover;
      width: 100%;
      transition: transform 0.4s ease;
    }
    .img-hover:hover .cover-img { transform: scale(1.05); }

/* roulang page: article */
:root {
  --primary: #6D28D9;
  --primary-hover: #8B5CF6;
  --accent: #14B8A6;
  --accent-hover: #2DD4BF;
  --gold: #F59E0B;
  --bg-light: #F8FAFC;
  --bg-dark: #0B1120;
  --text-main: #1E293B;
  --text-sub: #64748B;
  --border-color: #E2E8F0;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 8px 24px rgba(30,41,59,.1);
  --shadow-lg: 0 16px 40px rgba(30,41,59,.14);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,sans-serif;
  background: #fff;
  color: var(--text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font-family: inherit; }
.container { width: 100%; max-width: 1280px; margin-left: auto; margin-right: auto; padding-left: 1rem; padding-right: 1rem; }
@media (min-width: 640px) { .container { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .container { padding-left: 2rem; padding-right: 2rem; } }

/* Nav */
.nav-link {
  position: relative;
  padding: 0.45rem 0.25rem;
  font-size: 0.93rem;
  font-weight: 500;
  color: #CBD5E1;
  transition: color .2s ease;
}
.nav-link:hover { color: #fff; }
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--primary-hover);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-link.active { color: #fff; font-weight: 600; }
.nav-link.active::after { background: var(--primary); transform: scaleX(1); }
.nav-link:focus-visible {
  outline: 2px solid var(--primary-hover);
  outline-offset: 4px;
  border-radius: 4px;
}
.mobile-link {
  display: block;
  padding: 0.9rem 0.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: #CBD5E1;
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: color .2s ease, padding-left .2s ease;
}
.mobile-link:hover { color: #fff; padding-left: 0.9rem; }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 500;
  font-size: 0.92rem;
  border: none;
  cursor: pointer;
  transition: all .2s ease;
  box-shadow: 0 4px 14px rgba(109,40,217,.25);
}
.btn-primary:hover { background: var(--primary-hover); box-shadow: 0 8px 22px rgba(139,92,246,.3); }
.btn-primary:active { transform: scale(.96); }
.btn-primary:focus-visible { outline: 2px solid var(--primary-hover); outline-offset: 2px; }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1.4rem;
  border-radius: 8px;
  background: #fff;
  border: 1.5px solid var(--border-color);
  color: #475569;
  font-weight: 500;
  font-size: 0.92rem;
  transition: all .2s ease;
}
.btn-secondary:hover { border-color: var(--primary-hover); color: var(--primary); box-shadow: var(--shadow-sm); }
.btn-secondary:active { transform: scale(.97); }
.btn-secondary:focus-visible { outline: 2px solid #C4B5FD; outline-offset: 2px; }

/* Badges & Tags */
.badge-purple {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.72rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 500;
  background: #F5F3FF;
  color: var(--primary);
  border: 1px solid #EDE9FE;
}
.badge-teal {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.72rem;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(20,184,166,.12);
  color: #0F766E;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  background: #F5F3FF;
  color: var(--primary);
  border: 1px solid #EDE9FE;
  transition: all .2s ease;
}
.tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Section */
.section-bar {
  display: block;
  width: 4rem;
  height: 4px;
  border-radius: 9999px;
  background: var(--gold);
  margin-bottom: 1.1rem;
}
.section-title {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--text-main);
}
@media (min-width: 768px) {
  .section-title { font-size: 2.1rem; }
}

/* Breadcrumb */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem; }
.breadcrumb a { color: #94A3B8; transition: color .2s; }
.breadcrumb a:hover { color: #A78BFA; }
.breadcrumb .sep { color: #475569; }
.breadcrumb .current { color: #E2E8F0; }

/* Article Content */
.article-content p {
  margin-bottom: 1.5rem;
  line-height: 2;
  text-indent: 2em;
  color: #334155;
  font-size: 1rem;
}
.article-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 2.5rem 0 1.1rem;
  padding-left: 1rem;
  border-left: 4px solid var(--primary);
  line-height: 1.4;
}
.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--text-main);
}
.article-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.6rem 0 0.8rem;
  color: var(--text-main);
}
.article-content img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  margin: 2rem auto;
}
.article-content blockquote {
  border-left: 4px solid #CBD5E1;
  padding: 0.25rem 0 0.25rem 1rem;
  color: var(--text-sub);
  margin: 1.75rem 0;
  background: #F8FAFC;
  border-radius: 0 8px 8px 0;
}
.article-content ul {
  list-style: disc;
  color: #334155;
  margin: 1rem 0 1.6rem 1.4rem;
}
.article-content ul li { margin-bottom: 0.5rem; line-height: 1.8; }
.article-content ul li::marker { color: var(--primary); }
.article-content ol {
  list-style: decimal;
  color: #334155;
  margin: 1rem 0 1.6rem 1.4rem;
}
.article-content ol li { margin-bottom: 0.5rem; line-height: 1.8; }
.article-content ol li::marker { color: var(--primary); font-weight: 600; }
.article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(109,40,217,.3);
  transition: color .2s, text-decoration-color .2s;
}
.article-content a:hover { color: var(--primary-hover); text-decoration-color: currentColor; }
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.9rem;
}
.article-content th,
.article-content td {
  border: 1px solid #E2E8F0;
  padding: 0.75rem 1rem;
  text-align: left;
}
.article-content th { background: #F8FAFC; font-weight: 600; }
.article-content figure { margin: 2rem 0; }
.article-content figcaption {
  text-align: center;
  font-size: 0.85rem;
  color: #94A3B8;
  margin-top: 0.6rem;
}
.article-content iframe {
  width: 100%;
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

/* Prev / Next */
.prevnext-card {
  display: block;
  background: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  transition: all .25s ease;
}
.prevnext-card:hover {
  border-color: #C4B5FD;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Related Cards */
.related-card {
  display: block;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .25s ease;
}
.related-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: #C4B5FD;
}

/* Footer */
.footer-link {
  color: #94A3B8;
  font-size: 0.875rem;
  transition: color .2s ease;
}
.footer-link:hover { color: #fff; }

/* CTA Banner */
.cta-banner {
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  pointer-events: none;
}
.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -60%;
  left: 15%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(0,0,0,.1);
  pointer-events: none;
}

/* FAQ */
.faq-item { border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; transition: border-color .25s ease, box-shadow .25s ease; }
.faq-item:hover { border-color: #C4B5FD; box-shadow: var(--shadow-sm); }
.faq-question { width: 100%; text-align: left; padding: 1.1rem 1.25rem; font-weight: 500; font-size: 0.96rem; display: flex; justify-content: space-between; align-items: center; gap: 1rem; background: #fff; border: none; cursor: pointer; color: var(--text-main); transition: background .25s ease, color .25s ease; }
.faq-question:hover { background: #FAFAFE; }
.faq-question.active { color: var(--primary); background: #FBF9FF; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .3s ease; background: #fff; }
.faq-answer-inner { padding: 0 1.25rem 1.15rem; color: var(--text-sub); font-size: 0.92rem; line-height: 1.8; }

/* Misc */
.hero-glow {
  position: absolute;
  top: -30%;
  left: -15%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(139,92,246,.22) 0%, transparent 70%);
  pointer-events: none;
}
.hero-glow-2 {
  position: absolute;
  bottom: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(20,184,166,.16) 0%, transparent 70%);
  pointer-events: none;
}
.focus-glow { box-shadow: 0 0 0 4px rgba(109,40,217,.15); }

@media (max-width: 640px) {
  .article-content p { font-size: 0.95rem; }
  .section-title { font-size: 1.45rem; }
}

/* roulang page: category2 */
:root {
    --primary: #6D28D9;
    --primary-hover: #8B5CF6;
    --accent: #14B8A6;
    --accent-hover: #2DD4BF;
    --gold: #F59E0B;
    --bg-light: #F8FAFC;
    --bg-dark: #0B1120;
    --card-light: #FFFFFF;
    --text-main: #1E293B;
    --text-sub: #64748B;
    --text-dark: #E2E8F0;
    --text-dark-sub: #94A3B8;
    --border-light: #E2E8F0;
    --radius-btn: 8px;
    --radius-card: 12px;
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    background: var(--bg-light);
    color: var(--text-main);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  .container {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  img {
    max-width: 100%;
    height: auto;
    display: block;
  }

  a {
    color: inherit;
    text-decoration: none;
    transition: color .2s ease;
  }

  button {
    font-family: inherit;
    cursor: pointer;
  }

  /* 顶部导航 */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
  }

  .nav-link {
    position: relative;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-main);
    padding: .35rem .15rem;
    transition: color .2s ease;
  }

  .nav-link:after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--primary);
    opacity: 0;
    transform: scaleX(.4);
    transition: opacity .2s, transform .2s;
  }

  .nav-link:hover {
    color: var(--primary);
  }

  .nav-link:hover:after,
  .nav-link.active:after {
    opacity: 1;
    transform: scaleX(1);
  }

  .nav-link.active {
    color: var(--primary);
    font-weight: 600;
  }

  .nav-link:focus-visible {
    outline: 2px solid #C4B5FD;
    outline-offset: 4px;
    border-radius: 4px;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--primary);
    color: #fff;
    font-weight: 500;
    border-radius: var(--radius-btn);
    padding: 12px 24px;
    transition: background .2s, transform .15s, box-shadow .2s;
    border: none;
    font-size: 15px;
  }

  .btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 20px rgba(109, 40, 217, .25);
  }

  .btn-primary:active {
    transform: scale(.96);
  }

  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #fff;
    border: 1px solid #CBD5E1;
    color: #475569;
    font-weight: 500;
    border-radius: var(--radius-btn);
    padding: 12px 24px;
    transition: border-color .2s, color .2s, box-shadow .2s;
    font-size: 15px;
  }

  .btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 4px 12px rgba(100, 116, 139, .08);
  }

  .btn-teal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #14B8A6;
    color: #0F172A;
    font-weight: 600;
    border-radius: var(--radius-btn);
    padding: 12px 24px;
    transition: background .2s, transform .15s;
    border: none;
    font-size: 15px;
  }

  .btn-teal:hover {
    background: #2DD4BF;
    transform: translateY(-1px);
  }

  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 16px;
  }

  .section-tag:before {
    content: "";
    width: 24px;
    height: 4px;
    border-radius: 999px;
    background: var(--gold);
  }

  .card {
    background: var(--card-light);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-card);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  }

  .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(15, 23, 42, .08);
    border-color: #C4B5FD;
  }

  .footer-link {
    font-size: 14px;
    color: var(--text-dark-sub);
    transition: color .2s, padding-left .2s;
  }

  .footer-link:hover {
    color: #fff;
    padding-left: 4px;
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease, padding .35s ease;
  }

  .faq-item.open .faq-answer {
    max-height: 240px;
    padding-bottom: 16px;
  }

  .faq-item.open .faq-icon {
    transform: rotate(45deg);
    color: var(--primary);
  }

  .faq-icon {
    transition: transform .3s ease, color .2s;
  }

  .feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(109, 40, 217, .1);
    color: var(--primary);
    font-size: 22px;
    margin-bottom: 16px;
  }

  /* 深色卡片叠加 */
  .glass-card {
    background: rgba(30, 41, 59, .75);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(148, 163, 184, .2);
    border-radius: var(--radius-card);
  }

  /* 表格样式重置 */
  ::selection {
    background: rgba(109, 40, 217, .2);
  }

  @media (max-width: 1024px) {
    .mobile-menu {
      display: block;
    }
  }

  @media (min-width: 1025px) {
    .mobile-menu {
      display: none;
    }
  }

/* roulang page: category3 */
:root {
      --primary: #6D28D9;
      --primary-hover: #8B5CF6;
      --accent: #14B8A6;
      --accent-hover: #2DD4BF;
      --gold: #F59E0B;
      --dark-bg: #0B1120;
      --card-dark: rgba(30, 41, 59, 0.75);
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: #ffffff;
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1rem;
      padding-right: 1rem;
    }

    @media (min-width: 768px) {
      .container {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
      }
    }

    /* 导航 */
    .nav-link {
      position: relative;
      padding: 0.5rem 0.25rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: #64748B;
      transition: color 0.2s ease;
    }

    .nav-link:hover {
      color: var(--primary);
    }

    .nav-link.active {
      color: var(--primary);
      font-weight: 600;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      left: 0;
      right: 0;
      bottom: -2px;
      height: 2px;
      border-radius: 9999px;
      background: var(--primary);
    }

    .footer-link {
      color: #94A3B8;
      font-size: 0.875rem;
      transition: color 0.2s ease;
      display: inline-block;
    }

    .footer-link:hover {
      color: #ffffff;
    }

    /* 按钮 */
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: var(--primary);
      color: #ffffff;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.75rem 1.5rem;
      border-radius: 8px;
      border: none;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
    }

    .btn-primary:active {
      transform: scale(0.97);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: #ffffff;
      border: 1px solid #CBD5E1;
      color: #334155;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.75rem 1.5rem;
      border-radius: 8px;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .btn-teal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: var(--accent);
      color: #0F172A;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.5rem;
      border-radius: 8px;
      border: none;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-teal:hover {
      background: var(--accent-hover);
    }

    .btn-white {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: #ffffff;
      color: var(--primary);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.5rem;
      border-radius: 8px;
      border: none;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-white:hover {
      background: #F1F5F9;
    }

    /* 卡片 */
    .card-lift {
      transition: all 0.25s ease;
    }

    .card-lift:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -8px rgba(109, 40, 217, 0.15);
      border-color: #C4B5FD !important;
    }

    /* 区块标题短条 */
    .section-bar {
      width: 64px;
      height: 4px;
      border-radius: 9999px;
      background: var(--gold);
      margin-bottom: 1.5rem;
    }

    /* FAQ */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }

    .faq-item.open .faq-answer {
      max-height: 260px;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    .faq-icon {
      transition: transform 0.3s ease;
    }

    /* 表单控件 */
    .form-control {
      width: 100%;
      border: 1px solid #CBD5E1;
      border-radius: 8px;
      padding: 0.75rem 1rem;
      font-size: 0.9rem;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
      background: #ffffff;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.12);
    }

    .form-control::placeholder {
      color: #94A3B8;
    }

    /* 焦点可见性 */
    a:focus-visible,
    button:focus-visible,
    .btn-primary:focus-visible,
    .btn-outline:focus-visible,
    .btn-teal:focus-visible,
    .btn-white:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
      box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.2);
    }

    /* 侧栏列表 */
    .sidebar-link {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.65rem 0.75rem;
      border-radius: 8px;
      color: #475569;
      font-size: 0.9rem;
      transition: all 0.2s ease;
    }

    .sidebar-link:hover {
      background: #F1F5F9;
      color: var(--primary);
    }

    .sidebar-link.active {
      background: rgba(109, 40, 217, 0.08);
      color: var(--primary);
      font-weight: 600;
    }

    /* 步骤卡 */
    .step-num {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      flex-shrink: 0;
      margin-bottom: 1rem;
    }

    /* 数据卡 */
    .stat-card {
      background: rgba(30, 41, 59, 0.5);
      border: 1px solid rgba(148, 163, 184, 0.2);
      border-radius: 12px;
      padding: 1.5rem 1rem;
      text-align: center;
      backdrop-filter: blur(4px);
    }

    /* 移动端菜单 */
    .mobile-menu {
      border-top: 1px solid #F1F5F9;
      background: #ffffff;
    }

    .mobile-menu a {
      display: block;
      padding: 0.85rem 1rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: #475569;
      border-bottom: 1px solid #F1F5F9;
      transition: color 0.2s;
    }

    .mobile-menu a:hover {
      color: var(--primary);
    }

    .mobile-menu a.active {
      color: var(--primary);
      font-weight: 600;
    }